Defending champ Matt Kenseth had led more laps than anyone when, suddenly, his car began smoking on lap 149. He headed to pit road and it didn't take long for the crew to push him behind the wall, ruining any hopes of becoming the first back-to-back winner since Sterling Marlin in 1994-95.

Kenseth and his new teammates at Joe Gibbs Racing, Kyle Busch and Denny Hamlin, were actually running 1-2-3 when Kenseth had some sort of engine or transmission problem. Just two laps later, Busch's car also went out, smoking as well, sending the driver of the No. 18 machine storming through the garage, ripping off his racesuit.

"It's really unfortunate," Busch said. "We were running 1-2-3 and it felt like we were dropping like flies. Something inside the motor broke that's not supposed to break. It's a little devastating when you're running 1-2-3 like that. Hopefully the No. 11 (Hamlin) can bring it home."

EDWARDS' TOUGH MONTH: No one will be more eager than Carl Edwards to get out of Daytona.

The No. 99 team had a brutal month leading up to the NASCAR season opener, wrecking four times.

Make it five.

Edwards was caught up in a crash heading into turn one at the Daytona 500, another case of simply being in the wrong place at the wrong time. Trevor Bayne bumped Brad Keselowski from behind, which sent the No. 21 car sliding sideways.

SMOKE STEAMS: Tony Stewart has returned to the track at the Daytona 500.

But he's pretty much assured of going 0-for-15 in NASCAR's biggest race.

Stewart was 82 laps behind the leaders when he rolled out of the garage after an early crash. His frustration was never more evident than when he joined in the repair effort, banging on his No. 14 car with a hammer during the long stint in the paddock.

"To hell with the season," Stewart said. "I wanted to win the Daytona 500. We had a car that we could pass with today. We were passing cars by ourselves. I was so happy with our car, was just waiting for it to all get sorted out again. I don't know what started it, but we just got caught up in another wreck."

Stewart's misfortune came a day after he won the lower-division Nationwide race - his 19th career triumph at Daytona.